7110bb89ed
The `flask` CLI uses `setuptools` (or more specifically `pkg_resources`) [here](https://github.com/pallets/flask/blob/fdac8a5404e3e3a316568107a293f134707c75bb/src/flask/cli.py#L498) to discover third party commands, and just does nothing silently if it's not found. Add the dependency so custom commands start working.